Controlled caster wheel for agricultural implements



Jy 37 E93 F. D. JONES ET m.

coNTRoLLED cAsTER WHEEL. FOR AGRICULTURAL IMPLENENTS Filed Aug. 27, 19483 Sheets-Sheet l Juny m wm F. D. JONES ET AL 56%,?26

CONTROLLED CASTER WHEEL FOR AGRICULTURAL IMPLEMENTS Filed Aug. 27, 19483 Sheets-Sheet 2 30 MHV W9 w53 F. D. JONES ET AL 2956972@ CONTROLLEDCASTER WHEEL FOR AGRICULTURAL IMPLEMENTS Filed Aug. 27, 1948 3Sheets-Sheet 3 awcvzvrf: Fran/ Jones Zag .ne J'Zamfm @da Patented Jul-y17, 1.951:

CONTROLLE) CASTER WHEEL FOR AGRICULTURAL IMPLEMENTS Frank D. .iones andWayne E. Slavens, Des Moines, and Dale L. Woolsoncroft, Ankeny, Iowa,assignors to Deere Manufacturing Co., Dubuque, Iowa, a corporation ofIowa Application August 27, 1948, Serial No. 46,454

This invention relates to an agricultural implement or vehicle, and moreparticularly to means for controlling the caster wheel support of amobile frame.

Many mobile agricultural implements, of which the side delivery rake istypical, are propelled by a tractor or other draft source in such mannerthat the implement is subjected to considerable side draft. As is wellknown, this side draft is due to a lateral offset between the hitchpoints between the tractor and implement and the point on the implementon which the load is imposed in greatest magnitude. In a side deliveryrake, the main supporting frame for the rake is normally disposed insuch manner as to trail lon gitudinally behind the propelling source,but the reel frame and the revolving reel carried thereby operate at anangle to the line of draft for the purpose of raking and delivering hayor other crops to one side of the machine. Consequently, the rake framehas a tendency to swing about its hitch point in a direction opposite tothe direction in which the hay or other crop is being delivered into awindrow. The usual tractor-drawn sid-e delivery rake comprises a pair oflaterally spaced apart forward wheels for supporting the forwardl end ofa generally longitudinally vextending rake frame which has its rear endsupported on a trailing caster wheel. The forward end of the frame isconnected by a single point of draft -connection to the tractor orsimilar propeiling source and heretofore the caster wheel has beenVuncontrolled so that it would be free to oscillate about a verticalaxis as the rake frame tended to swing about the vertical axis of thehitch connection. According to `the present invention, control means isprovided for the caster wheel and this means preferably takes the formof a pair of vreleasably interlocking elements, one carried by thecaster wheel and lthe other carried-by the implement or rake frame. Theparts are normally Airl-- terl'ocked by yieldable means which operate tohold the caster wheel in straight-ahead position' except when the casterwheel is subjected to iside pressures in excess of a predeterminedvalue.

Another object of the invention is to provide means for adjusting theangularity of the caster wheel with respect to the rake.frame,preferably by adjusting laterally the point at which thereleasable parts interlock. In this respect, Aa further object is toVprovide convenient and eiiicient means for accomplish-ing thisadjustment.

The usual side delivery .rakes operate to :deliver hay or 4other cropsto form a windrow to the left side of the machine, Las viewed fromaposition be-f hind :the machine and looking forwardly.` vCon-Asequently, the tendency of the rear end rof the rake frame is to swingto the right. According to the present invention, Ythe releasablepartsare 603 15 Claims. (Cl. 56m-321) the structure shown in F so constructedand arranged as to require greater sidev pressure to release the partsfor castering of the wheel to the right than the side pressure requiredVfor releasing the wheel for castering to the v left. In the operation ofthe rake, turns at the end of the field will be made to the right andthe side pressure on the caster wheel will naturally be to the left, orin the direction of easier release of the interlocking parts.

Aside from the foregoing and other objects and advantages of theinvention in normal operation of the rake, there are additionaladvantages obtained in transporting the rake at high speeds, inasmuch asthe interlocking parts between the frame and caster wheel preventswaying of the machine from side to side. This arrangement contributesmaterially to the safety of both the machine and the operator in thetransporting of the machine at high speeds over paved highways or evenat slower speeds over rough fields and in going from one field toanother.

The foregoing and other important objects and desirable featuresinherent in and encompassed by the invention will become apparent tothose skilled in the art as a detailed disclosure is made inA thefollowing specication of two preferred forms of the invention asillustrated in the accompanying sheets of drawings in which:

Figure 1 is a top plan View of a mobile agricultural implement asexemplified by a side delivery rake of the type that is towed behind atractor;

Figure 2 is an enlarged fragmentary view, partly in section, of the rearportion of the rake frame including the interlocking parts between theframe and the caster wheel;

Figure 3 is a fragmentary enlarged View, 4partly in longitudinal sectionas viewed along the line 3 3 of Figure 1;

Figure 4 is an enlarged fragmentary sectional view as viewed along theline '1 -ll of Figure 2;

Figure 5 is a side elevational fragmentary view of a modified form ofthe invention;

Figure 6 is a plan view, partly in section, of 'gure 5, as viewed alongthe line 6-8 of Figure 5; and

Figure '7 is an enlarged sectional view taken along theline -l of Figure6.

Figures 41--4 The general construction of the implement las exemplifiedby the side delivery .rake shown in Figure l includes a generallylongitudinally extending irame designated by the numeral i0. This frame`comprises a right hand longitudinal frame bar Il and a left handlongitudinal frame bar I2. The bars are cross connected at their forwardends by a transverse frame ,member 1.3 and the bars converge at theirrear ends .and are assembled with .a vcasting id which provides part ofsupporting means for the rear end of the frame, as will appear below.

The frame .bars II and i?. are cross braced intermediate their iront andrear ends by a plurality of transverse members I5. The frame I6 isarched intermediate its iront and rear ends so that the frame bars IIand I2 are disposed at a considerable height above the ground, the rakein this respect being of conventional design. The forward end of theframe I6 is carried on a rolling ground support comprising a transverseaxle I6 and a pair of laterally spaced ground wheels i1. Theground-engaging means for support of the rear end of the frame I6includes a single caster wheel IB carried on an axle I9 which inn cludesa substantially upright or vertical standard or post 25. The post may bejournaled in 'the casting I4 by any appropriate bearing, the de-` tailsof which are notl important here and have not been shown.

The rake frame I has suspended below it a diagonally arranged reel frame2l within which is supported a rotatable reel 22. The reel frame 2i ispivotally supported at 2?. and 25 on the rake frame I6 and may beadditionally and adjustably supported by other means omitted herebecause theyform no part of the present invention. The forward end ofthe frame I6 is connected toa foru wardly extending hitch fra-mepreferably comprising a pair of forwardly converging bars con nected toa clevis Z6 by means of which a hitch connection may be made to atractor or other source of draft power. Arrows and legends have beenused in Figure l to designate the direction of travel of the rake andthe imposition of side draft during normal straight-ahead operation.

In the form of the invention shown in 'Figures 1-4, the control meansfor the caster wheel I6 comprises fundamentally a pair of releasablyinterlocked vmembers operating between the rake frame I6 and the casterwheel I6. As best shown in Figure 2, one of the members is a transversearcuate member 21 preferably in the form of a weld-fabricated angle bar(Figure 13') This member is secured at its opposite ends respectively tothev frame bars I I and I2 of the rake frame ,I 6, the securing beingpreerably accomplished by bolts 25 and 29 and tail nuts 36 and 3l. Theframe bars t and I2 are respectively vertically aper tured'to receivethe bolts 28 and 29 and opposite ends of the arcuate member 21 areslotted at 32 and 33; and the bolts 26 and 29 pass respectively throughthe slots. The member 21 is disposed just forwardly of the caster wheelstandard or post 2U and the slots 32 and 33 are formed on an arc havingthe vertical axis of the standard 25 as its center. The arrangement issuch that the lateral position of the member 21 on the frame I6 may bechanged by loosening the tail nuts and 3l, shifting the member 21 andthen retightening the tail nuts.

It is one of the features of this form of the invention to provideconvenient means for accomplishing this adjustment. For this purpose, alcentral portion of the member 21 includes a mounting lug 34 (Figure 3)spaced below an intermediate portion of the horizontal part of themember and apertured at 35 below and in vertical alignment with anaperture 35 in a central portion of the member 21. The lug 3d is rigidlysecured. to the member 21, as by welding at 31. An internally threadedmember in the form of a cy lindrical nut 38 is provided with a pair ofdiametrically opposed trunnions 39 which are received in the apertures35 and 36.

The left hand frame bar I2 (Figure 4) carries at its underside a bracket40 which is secured to the member l2 by the bolt 29 and a second bolt4I. As best shown in Figure 2, the bracket 4E) is in transversealignment with the adjusting nut 3S and the bracket and the underportion of the frame bar I2 are apertured in vertical aligna ment at I2and 43 to receive trunnions 44 which are formed on a collar (55. Anadjusting crank i6 is provided with an externally threaded straightportion 'l which is received by the nut 38. The unthreaded portion ofthe straight part of the crank is journaled in the collar i5 and pins 68are carried by the crank at each side or" the collar to preclude axialshifting of the crank with respect to the collar. It will thus be seenthat turning of the crank will result in shifting of the member 21 afterthe tail nuts 3G and 3i have been loosened.

The vertical or depending fiange portion of the member 21 comprises anarcuate track having a pair of arcuate portions and 5I which areseparated by an arcuate notch 52. Although both arcuate track portionsand 5I are formed about the substantially vertical axis of the casterwheel standard 25 as a center, the radius of the track portion 55 issomewhat shorter than that of the track portion 5I. The arcuate notch 52forms a junction at 53 with the arcuate track portion 55 and, at itsother side, the notch 52 forms a junction at with the other trackportion 5I. The notch and its junctions 53 and 54 with the track providepart of cam means cooperative with another carn part to be describedbelow. The radius of the junction or corner 53 is somewhat sharper thanthe radius of the corner or junction 5ft. The purposes of the particulardesign of the track portions 56 and 5I and notch 52 will appear below.

The other member of the two that comprise the interlocking means betweenthe frame I0 and caster wheel I6 is designated generally by the numeral55 and includes an internally recessed part 56 which extends forwardlyfrom the caster wheel standard 20 substantially as a radius thereoftoward the notch 52 in the transverse arcuate member 21. The internalrecessing of the part 56 is accomplished by a first bore 51 and acounterbore 58. The bore 51 carries for longi? tudinal or axial slidingtherein a plunger 55v which has its inner end extending into thecounterbore 56 and secured to the forward end of a compression spring6l). The rear end of the spring is seated on a spring seat 6I securedvto the part 56 by a pair of cap screws 62 which pass also through anapertured clip or bracket 63. The clip is rigidly secured to the casterwheel standard 20, as by welding at 64 (Figure 2). The member 55 is thusrigidly carried by the caster wheel standard.

The plunger 59 is preferably square in cross section, as is the bore 51,and the plunger is thus prevented from rotating in the part 56. Theouter or forward part of the plunger 59 is bifurcated or slotted at(Figure 3) and carries a roller 66. This roller provides a cam partcooperative with the cam part 52-53--54 and, in thel normal orstraight-aheadl relationship of the members 21 and 55, the roller 66interts withthe notch 52 and thus the members operate under the springloading of the spring 60 to keepv 'the members releasably interlocked.As best shown in Figure 3, a pin 61 is passed transversely through thepart 56 and through the bfurcated portion 65 of the plunger 59. servesto limit forward movement of the plunger The pin 61 thus 5 59 underaction of the spring 60. The bore 51 may be provided at its forward endwith means for supplying lubricant to the plunger 59, this means in thepresent case including an annular recess 68 to which lubricant may besupplied by a oonventional lubricant fitting 59.

The members 21 and 55 are relatively adjusted so that the notch 52 issubstantially centrally ahead of the caster wheel standard or post 20,this position of the parts being that for straightahead travel of therake frame under normal conditions. Inasmuch as the arcuate corner orjunction 53 between the notch 52 and the right hand arcuate track 5|) isrelatively sharp, side pressures tending to turn the caster wheel I8about the substantially vertical axis of the standard 20 in onedirection must be somewhat greater than side pressures from the oppositedirection. It will be noted that normal side draft on the rake framewill tend to release the interlock between the members 21 and 55 so thatthe caster wheel may swing freely to the right, or in a clockwisedirection, as viewed in Figures 1 and 2. In instances in which the cropis particularly heavy, the side draft will naturally increase andrelease of the caster wheel may occur frequently with the members set asshown in the drawings. To overcome this diiilculty, the member 21 may beadjusted a desired amount to the left, thus setting the plane of thecaster wheel I8 at a slight angle to a longitudinal vertical planepassed through the axis of the caster wheel standard 20. The casterwheel, thus set, will thus have a greater tendency to keep the frame Ifrom swinging to the right and side pressures on the caster wheel,eifective to release the interlock between the members 21 and 55, willhave to be correspondingly greater.

On the other hand, adjustment of the member 21 to the right will resultin angling of the caster wheel I8 to the right, or in the direction ofnormal side draft imposed on the machine, whereupon it will be foundthat the raking width of the implement may be narrowed. Theseadjustments are conveniently accomplished by the simple expedient ofloosening the tail nuts 30 and 3|, rotating the crank 45 in the desireddirection, and securing the adjustment by tightening the tail nuts.

Inasmuch as the radius of the arcuate track 50 is somewhat shorter thanthat of the arcuate track 5|, release of the roller 55 for swinging ofthe caster wheel IB and member 55 to the right will impose upon thespring 60 a greater loading than imposed upon the spring in release andswinging of the member 55 to the left, as a result ofY which the member55 will more easily be returnable to its central or interlockingposition. That is to say, when the member 55 is released for swinging tothe right, it must, in order to returnto central position, overcome theside draft on the machine. Therefore, the radius of the arcuate track 50is made shorter so that the spring 5|) is more heavily loaded than isrequired when the member 55 is released to the left, inasmuch as theimposition of normal side draft will tend to return the member 55. Thespring 5D- is,` of course, calibrated with respect to the expected sidepressures and the parts are arranged so that the interlock therebetweenwill release before any of the parts suffer damage.

Figures 5, 6 and 7 In this form of the invention, the basic conceptinvolved in the modication described above a caster wheel similar to thecaster wheel I8.

One of the two members that comprise the re' leasable interlock betweenthe caster wheel and. the rake frame comprising the members 10 and. 1|includes a first member 15 of generally trian gular shape having itsapex portion welded orl otherwise rigidly secured at 15 to the casterThe base portion of the tri-- wheel standard 1d. angular member 15 is inarcuate form comprising a first arcuate track 11 and a second arcuateltrack 18 separated by an intermediate arcuate notch 19.

laterally from the axis of the caster wheel standard 14, as at and 8|,the purpose of which will.

presently appear.

The second member of the releasably inter-- locked means preferablycomprises a transverse.l angle bar 82 supported at its opposite end byand;

below the frame bars i5 and 1|. The supporting: of the opposite ends ofthe member or bar 82 is; accomplished by a of bolts 83 and 8d and'k apair of cooperating tail nuts S5 and 55, the frame bars 'i5 and 1| beingappropriately aper tured and the opposite ends of the member 82T beingslotted respectively at S1 and 88. The slots. are diagonally disposedwith respect -to the principal axis of the member 82 and correspondgen-- erally in structure and function with the arcuate slots 32 and 33in the member 21 of the modification described above. The slots and thereleasable securing means comprising the bolts 53 and 8d and tail nuts55 and Se provide means whereby the member 52 may be adjustedtransversely with. respect to the frame bars 1@ and 1i.

The interlock between the members 82 and 15 is accomplished by meansincluding a plunger which carries a roller 9| normally interfltting withthe notch 18 in themember 15. For this. purpose, an intermediate portionof the member 82 carries an inverted angle bar 52 which is appropriatelyapertured in alignment with an aperture in the depending ange of theangle bar S2.. A forwardly extending clip or bracket S3 has aA dependingportion S which is apertured in longitudinal alignment with theapertured portions ci the bars 52 and S2. The plunger 95 is thus axiallyslidable but non-rotatably carried in the members 52, 52 and 95. Acompression spring S5 operates between the clip 53 and plunger' @il tourge the roller 5| into engagement with the notch 19. spring 55 seats atone end on the outermost of a plurality of shims 55 and at its other endagainst a washer 91- held in place on the plunger` Si] by a pin 93.

Adjustment of the member 32 with respect to the frame bars 1@ and 1| maybe determined by indicating means comprising a pointer |55 secured tothe right hand side of the left hand, frame bar 1| and cooperating witha plurality of graduations i5! provided on the upper proximate surfaceof the member 82.

The general characteristics of the rake equipped with the modified formof the invention shown in Figures, 6 and '7 will be the same as those ofa rake equipped with the modification.

The radii of the arcuate tracks 11 and 18 are respectively formed aboutcenters offsetI The shown in Figures 1-4. The lateral offsetting of thecenters for the arcuate tracks 'l and 1B with respect to the center ofthe caster wheel standard 'i4 will result in increased loading on thespring 95 as the member l5 becomes released for swinging with respect tothe roller 9|, whereby the members will be more readily restorable tonormal or interloclsed position.

Adjustment of the spring 95 may be accomplished by removing or addingshims at 96.

Summary Both forms of the invention illustrate preferred means forcontrolling the caster wheel on an agricultural implement, preferably asexemplified by a side delivery rake. It will be understood, of course,that the principles of the invention may be adapted to other implements,particularly those in which the supporting frame trails behind a tractoror other source cf draft power. In any event, the control of the casterwhe-el is highly advantageous in either normal operating of theimplement or in transporting the implement at high speeds over highways.Other advantages of either form of the invention not specicallyenumerated above will undoubtedly occur to those vers-ed in the art, aswill various modiications and alterations in the preferred forms of theinvention illustrated, all of which may be accomplished withoutdeparting from the spirit and scope of the invention as defined in theappended claims.

What is claimed is:

l. For a mobile implement having a frame carried for normal travelforwardly over the ground by ground-engaging means at one portion of theframe and at another portion of the frame by a caster wheel providedwith a pivot standard for castering of the wheel about a generallyvertical axis; caster wheel control means comprising a iirst memberhaving means for fixed connection to the frame; second member havingmeans for fixed connection to the caster Wheel standard; means yieldablyinter-locking said members for holding the caster wheel standard in anoperating position against pivoting about its axis when subjected toside pressures below a predetermined magnitude; and means for adjustingone of the members laterally of the frame with respect to the other forselectively shifting the operating position of the caster Wheel standardlaterally.

2. For a mobile implement having a frame carried for normal travelforwardly over the ground by ground-engaging means at one portion of theframe and at another portion of the frame by a caster wheel providedwith a pivot standard for castering of the wheel about a generallyvertical axis: caster wheel control means comprising rst and secondmembers positionable adjacent the caster wheel standard, one of saidmembers extending transversely of the frame in the form of an arc aboutthe axis of the caster wheel standard and having a notch interruptingsaid arc, and the other member including a releasable roller engageablewith said notch; means for mounting one of said members on the frame,and means for mounting the other member on the caster wheel standard,one of said means including provision for lateral adjustment of onemember relative t0 the other; biasing means operative to hold thereleasable roller in engagement with the notch for releasably fixing thecaster Wheel standard in a normal operating position against lateralswinging about its axis and providing for release 0f the roller ineither lateral direction for rolling over said arc as said caster wheelstandard swings to one side or the other in response to side pressure onthe caster Wheel above a predetermined value; and means for adjustingthe adj ustably mounted member laterally with respect to the other forvarying in either direction the position of inter-engagement between theroller and the notched member.

3. For a mobile implement having a frame carried for normal travelforwardly over the ground by ground-engaging means of one portion of theframe and at another portion of the frame by a caster wheel providedwith a pivot standard for castering of the wheel about a generallyvertical axis: caster wheel control means comprising nrst and secondmembers positionable adjacent the caster wheel standard, one of saidmembers extending tranversely of the frame and having a notchinterrupting said arc, and

the other member including a releasable part engageable with said notch;means for mounting one of said members on the frame, and means formounting the other member on the caster wheel standard, one of saidmeans including provision for lateral adjustment of one member relativeto the other; biasing means operative to hold the releasable part inengagement with the notch for releasably xing the caster wheel standardin a normal operating position against lateral swinging about its axisand providing for release of the part in either lateral direction assaid caster wheel standard swings to one side 01 the other in responseto side pressure on the caster wheel above a predetemined value; andmeans for adjusting the adjustably mounted member laterally with respectto the other for varying in either direction the position ofinter-engagement between the releasable part and the notched member.

4. The invention defined in claim 3, further characterized in that: thenotched member is so constructed and arranged with respect to thereleasable part as to require greater side pressure on the caster wheelin one lateral direction than in the opposite lateral direction toeffect release oi' said part from the notch.

5. The invention defined in claim 3, further characterized in that: thenotched member has an arcuate lateral portion at each side of the notch,each portion being formed generally on a radius about the caster wheelstandard axis and one radius being longer than the other.

6. The invention dened in claim 3, further characterized in that: thenotched member has an arcuate lateral portion at each side of the by acaster wheel provided with a pivot standard for castering of the wheelabout a generally vertical axis: caster wheel control means comprisingrst and second members positionable adjacent the caster wheel standard,one of said members extending transversely of the frame and having anotch interrupting said arc, and the other y member including areleasable part engageable with said notch; means for mounting one ofsaid Y members on the frame, and means for mounting the other member onthe caster wheel standard, one of said means including provision forlateral adjustment of one member relative to the otherl biasing meansoperative to hold the releasable part in engagement with the notch forreleasably xing the caster wheel standard in a normal operating positionagainst lateral swinging about its axis and providing for release of thepart inv either lateral direction as said caster wheel standard swingsto one side or the other in response to side pressure on the casterwheel above a predetermined value; means for adjusting the adjustablymounted member laterally with respect to the other for varying in eitherdirection the position of inter-engagement between the releasable partand the notched member; and gauge means for indicating the amount ofrelative adjustment between said members.

8. For a mobile implement having a frame carried for normal travelforwardly over the ground by ground-engaging means at one portion of theframe and at another portion of the frame by a caster wheel providedwith a pivot standard for castering of the wheel about a generallyvertical axis: caster wheel control means comprising an arcuate trackmember adjacent the caster wheel standard having a pair of arcuateportions formed generally about the standard axis of the' caster wheeland separated by a notch substantially centrally thereof; means foradjustably securing the track member to the frame for lateral adjustmentto selectively position the notch with respect to a fore and aftvertical plane passed through the caster wheel standard axis; aswingable member having means :for connection to the caster wheelstandard for swinging therewith and having a movable roller engagingsaid notch to position the caster wheel with respect to the frame; andspring-pressed means between the roller and the swingable member forurging the roller into the notch.

9. For a mobile implement having a frame carried for normal travelforwardly over the ground by ground-engaging means at one portion of theframe and at another portion of the frame by a caster wheel providedwith a pivot standard for castering of the wheel about a generallyvertical axis: caster wheel control means comprising an arcuate trackmember positionable adjacent the caster wheel standard and having a pairof arcuate portions formed generally about the axis of the caster wheeland separated by an arcuate notch substantially centrally thereof, the

junction of one end of the arc of the notch with the arc of one trackportion being on a -radius smaller than the radius at the junction ofthe other end of the arc of the notch with the arc of the other trackportion; means for adjustably securing the track member to the frame forlateral adjustment to selectively position the notch with respect to afore and aft vertical plane passed through the caster wheel standardaxis; a swingable member having means for connection to the caster wheelstandard for swinging therewith and having a movable roller engagingsaid notch to position the caster wheel with respect to the frame; andspring-pressed means between the roller and the swingable member forurging the roller into the notch.

l0. For a side delivery rake having a trailing frame including a pair cfrearwardly converging frame bars interconnected at their rear ends andsupported on a caster wheel standard turnable about a generally verticalaxis and including a ground-engaging caster wheel: control means for thecaster wheel, comprising a rst member positionable transversely acrossth@ frame bars ahead Vof the caster wheel standard; means for mountingsaid member at its opposite ends on the frame bars and providing forlateral adjustment of the members; a second member having means forconnection to the caster wheel standard and projecting forwardly intoproximity to the first member; means providing an arcuate track on thefirst member formed generally about the axis of the caster wheelstandard; means providing a longitudinal recess in the second member; aspring-loaded plunger sliclably carried in the recess and including apart engaging the arcuate track; and cam means cooperative between theplunger part and the track for generally centering the plunger part andtrack to hold the caster wheel standard against swinging about its axisuntil side pressure on the caster wheel overcomes the spring loading onthe plunger.

1l. The invention defined in claim 10, further characterized in that:the adjustable mounting of the lirst member on the frame bars includesreleasable securing means and laterally arcuate slots.

12. The invention dened in claim l1, further characterized in that:screw-threaded adjusting means is provided for positioning between thefirst member and at least one of the frame bars to shift the memberlaterally and arcuately.

13. For a mobile implement having a frame carried for normal travelforwardly over the ground by ground-engaging means at one portion of theframe and at another portion of the frame by a caster wheel providedwith a pivot standard for castering of the wheel about a generallyvertical axis: caster wheel control means comprising a first memberhaving means for connection to the frame; a second member having meansfor connection to the caster wheel standard; a spring-loaded partmovable on one member toward the other member; and cam means includingsaid spring-loaded part and a cooperating part on the other membernormally inter-engageable for holding the caster wheel standard againstswinging about its axis and releasable when side pressure on the casterwheel exceeds the effectiveness of the spring-loaded part.

14. For a mobile implement having a frame carried for normal travelforwardly over the ground by ground-engaging means at one poi'- tion ofthe frame and at another portion of the frame by a caster wheel providedwith a pivot standard for castering or the wheel about a generallyvertical axis: caster Wheel control means f comprising a rst memberpositionable generally transversely across the frame as respects theline of travel and adjacent the caster wheel standard; means forreleasably securing said member to the frame for lateral adjustmentthereof; a second member having means for connection to the caster wheelstandard and extending in proximity to the rst member; cam meansincluding a spring-loaded part on one member and a cooperating part onthe other member normally inter-engageable to nx the caster wheelstandard against lateral swinging and releasable when side pressure onthe caster wheel exceeds the effectiveness of said spring-loaded part;and means for adjusting said frame-mounted member laterally with respectto the frame, comprising a lug on said member, a screw-threaded partcarried by the lug, and an adjusting element adapted to be rotatably butnon-shiftably carried by the frame and having a screw-threaded portioncooperating with said screw-threaded part.

11 15. For a mobile implement having a frame carried for normal travelforwardly over the ground by ground-engaging means at one portion of theframe and at another portion of the frame by a caster wheel providedwith a pivot standard for castering of the wheel about a generallyvertical axis: caster wheel control means comprising a first memberpositionable generally transversely across the frame as respects theline of travel and adjacent the caster Wheel standard; means forreleasably securing said member to the frame for lateral adjustmentthereof; a second member having means for connection to the caster wheelstandard and extending in proximity to the rst member; cam meansincluding a spring-loaded part o n one member and a c0- operating parton the other member normally inter-engageable to X the caster Wheelstandard against lateral swinging and releasable When side pressure onthe caster wheel exceeds the effectiveness of said spring-loaded part;means for adjusting said frame-mounted member laterally with respect tothe frame; and means including adjustment indicating elements carriedrespectively by the frame and said rst member.

FRANK D. JONES.

WAYNE E. SLAVENS.

DALE L. WOOLSONCROFT.

REFERENCES CITED The following references are of record in the file ofthis patent:

Number Re. 12,194 291,426 419,297 752,742 1,118,837 1,285,963 1,546,61715 1,651,938 1,896,234 2,370,355 2,396,277 2,445,865

Number UNITED STATES PATENTS

